Search found 44 matches
- Fri Sep 07, 2018 9:03 am
- Forum: code_saturne usage
- Topic: Initializing turbulent flow
- Replies: 4
- Views: 3761
Re: Initializing turbulent flow
Hello, Concerning the initialisation you can read paragraph 6.3 of the user guide of version 5.0 for instance. Concerning the inlet BC for turbulence, you can either chose established profile with an hydraulic diameter given by the user, or hydraulic diameter and a turbulence intensity. See for inst...
- Fri Sep 07, 2018 7:11 am
- Forum: code_saturne usage
- Topic: Usage of ALE Module in a duct
- Replies: 3
- Views: 2346
Re: Usage of ALE Module in a duct
Hello, Is it a valve you want to model? If yes, this boundary should be considered as moving walls. If it is inlet outlet boundary conditions, as mention in the user and the theory guide, isolib BC type retain the flow (imposing a 0 mass flux) when entering (it is a free outlet, but not inlet is all...
- Wed Nov 08, 2017 9:10 am
- Forum: code_saturne usage
- Topic: cs_user_head_losses.c vs cs_user_source_terms.f90
- Replies: 1
- Views: 1606
Re: cs_user_head_losses.c vs cs_user_source_terms.f90
Hello Daniele,
That is not normal. What is the version you are using?
Best regards
Martin
That is not normal. What is the version you are using?
Best regards
Martin
- Mon Oct 09, 2017 8:47 am
- Forum: code_saturne usage
- Topic: Zero gradient at certain faces
- Replies: 26
- Views: 14815
Re: Zero gradient at certain faces
Dear Odion,
a call function was missing for the vector coupling. I added that to the trunk version. The computation is not crashing anymore but the solvers are not converging properly.
I look at it in the coming days.
Best Regards
Martin
a call function was missing for the vector coupling. I added that to the trunk version. The computation is not crashing anymore but the solvers are not converging properly.
I look at it in the coming days.
Best Regards
Martin
- Mon Sep 25, 2017 7:57 am
- Forum: code_saturne usage
- Topic: Constant Diffusivity of scalar with drift flux in CS 5.0.4?
- Replies: 5
- Views: 3014
Re: Constant Diffusivity of scalar with drift flux in CS 5.0
Hello,
You can activate a variable diffusivity and give the same value for all the cells. We have to correct this combination.
Best regards
Martin
You can activate a variable diffusivity and give the same value for all the cells. We have to correct this combination.
Best regards
Martin
- Tue Sep 27, 2016 6:11 am
- Forum: Discussion
- Topic: How to integrate a new term in equation for scalar ?
- Replies: 9
- Views: 10271
Re: How to integrate a new term in equation for scalar ?
Hello again,
Just a small additional remark: is "ni" a component of a vector? If so, I would suggest you to move to the trunk version because we add the capability to transport vector species (or if not it will be in the coming days).
Best regards
Martin
Just a small additional remark: is "ni" a component of a vector? If so, I would suggest you to move to the trunk version because we add the capability to transport vector species (or if not it will be in the coming days).
Best regards
Martin
- Mon Sep 26, 2016 8:11 pm
- Forum: Discussion
- Topic: How to integrate a new term in equation for scalar ?
- Replies: 9
- Views: 10271
Re: How to integrate a new term in equation for scalar ?
Hello Paul, Reading your problem, I think you can do it using DRIFT modelling. Your scalar is nothing else that transported by the velocity u plus a drift (proportional to grad phi). This is possible in version 4.0 to activate drift to a scalar (look at DRIFT in cs_user_parameters.f90) but usually t...
- Fri Aug 19, 2016 6:26 pm
- Forum: Discussion
- Topic: boundary contribution in cocg_s_it
- Replies: 4
- Views: 4979
Re: boundary contribution in cocg_s_it
Dear Cédric,
you are right, the new gradient does not need a specifi COCG matrix for cells touching a boundary (because this term is put as explicit, this was done for sake of simplicity for vectors and then extended to scalar to save some time of recomputing it).
Best Regards
Martin
you are right, the new gradient does not need a specifi COCG matrix for cells touching a boundary (because this term is put as explicit, this was done for sake of simplicity for vectors and then extended to scalar to save some time of recomputing it).
Best Regards
Martin
- Sat May 14, 2016 10:44 am
- Forum: Discussion
- Topic: Oil heat transfer with a low flow speed
- Replies: 4
- Views: 5897
Re: Oil heat transfer with a low flow speed
Hello,
Your flow is laminar (Re=10^-3), therefore no turbulence models are required.
Best Regards
Martin
Your flow is laminar (Re=10^-3), therefore no turbulence models are required.
Best Regards
Martin
- Tue Jan 19, 2016 8:09 pm
- Forum: code_saturne usage
- Topic: My first study: stratification
- Replies: 2
- Views: 3481
Re: My first study: stratification
Hello, I will try to answer to some of your interrogations. Concerning the warning about least square gradient, it is not a big deal (the criterion is not universal). What I would suggest for tetras is to use the least square gradient over extended neighbourhood by the way. Concerning the warning ab...